Machine for forming a rim on the back of watchcases



Dec. 2 4- 1,520,594

' J. MU LLER MACHINE FOR FORMING A RIM ON THE BACK OF WATCHCASES Filed March 5, 1924 2 Sheets-Sheet 1 ATTORNEY wnwzss;

J. MULLER MACHINE FOR FORMING A RIM ON THE BACK OF WATCHCASES 2 Sheets-Sheet 2 Filed March 5, 1924 INVENTOFI ATTORN EY WITNESS:

Patented Dec. 23, 1924.

PATENT OFFMZE.

UNITED STATES JOHN MULLER, OF BEECHURST, LONG ISLAND, NEW YORK.

MACHINE FOR FORMING A RIM ON THE BACK OF WATCHCASES.

Application filed March 3, 1924. Serial No. 696,714.

T all whom it may concern:

Be it known that I, J OI-IN MULLER, a citizen of United States, residing at Beechurst, Long Island, in the county of Queens and State of New York, have invented new and useful Improvements in Machines for Forming a Rim on the Back of Watchcases, of which the following is a specification.

This invention relates to machines for forming a rim on the back of watch cases.

The principal object of the invention is the provision of a machine for forming a fiat face on the back of a Watch case by means of a spinning tool which derives its power from a chuck carried by the head stock of a lathe.

Another object of the invention is to provide a tool holder capable of interchangeably receiving difierent style tools, which tools are necessary in spinning the back of a watch case in order to form the desired flat rim for holding the back to the body of a watch.

With these and other objects in view, the invention resides in certain novel construc tion and combination and arrangement of parts, the essential features of which are hereinafter fully described, are particularly pointed out in the appended claims, and are illustrated in the accompanying drawing, in which Figure 1 is a top plan view of my invention as shown applied to a portion of a lathe.

Figure 2 is a side elevation of the same.

Figure 3 is a vertical longitudinal sectional view on the line 33 of Figure 1.

Figure 4 is a transverse sectional view on the line 44 of Figure 2.

Figure 5 is a transverse sectional view on the line 55 of Figure 3.

Figure 6 is a detail perspective view of the tool holder per se.

Figure 7 is a view showing the back of a watch case before and after the spinning operation.

Referring more particularly to the drawing, the reference numeral 10 designates a portion of a lathe, which includes a bed 11, a head stock 12, a tail stock 13, and a carriage 14 slidably mounted in the bed for longitudinal and transverse movement thereon. This construction is old in the art but has been shown to illustrate the manner in wh ch my invention is applied.

The head stock 12 includes a threaded chuck 16 comprises a head or block 1'? hav I ing a threaded bore 18 therein for co-action with the threaded spindle so that the chuck may be removed from the spindle when desired. A. die 19 is removably carried by the head by means of a bolt 20, whereby to permit diflerent style dies to be supported for watch cases of various sizes. The die has its outer face formed with a recess 21 for the reception of a watch case back 22. A collar 23 encircles the die 18 and is slidably adjusted thereon for a purpose to be presently described. The collar 23 is provided with rods 24, slidable in bores 25 in the head 17 and serve as guides for the collar. Expansible springs 26 encircle the rods and extend into the bores and abut adjusting screws 27, threaded in the inner ends of the bores to permit the collar to be yieldingly mounted with respect to the head. The adjusting screws 27 serve to adjust the tension of the springs. The outer face of the collar 23 is provided with a tooth surface 23, which surface is curved in cross section as clearly shown in Figure 3 of the drawing. The exterior of the block or head 17 is threaded for a portion of its length as at 28 for the reception of an internally threaded cap 29, which cap co-acts with a flange 30 on the collar and retains the collar in adjusted position with respect to the die.

For holding the back 22 seated in the recess 21, I employ a stem 31 detachably secured to the tail stock 13, as at 32. The stem 31 has a disk or head 33 which is capable of being brought into co-acting clamping engagement with the die by an operating means 34 of the usual well-known con struction now employed for moving the spindle of the tail stock toward or away from the work. The carriage 12 supports a tool holder 35 which is pivoted to the carriage by a bolt 36. The carriage is formed with a pair of ears 37 for supporting a pair of adjusting screws 38 which act as stops for limiting the rocking or turning movement of the holder. A. pin 39 extends from the holder and supports a spinning tool 40. The spinning tool 40 comprises a bore 41 for the reception of the pin 39, a milled or tooth surface 42 for co-action with the teeth 23 on the die, and a smooth spinning surface 43. A groove 44 is formed in the outer periphery of the tool for co-action with a the recess 21 of the locking slide 45 adjustably mounted on the holder as at 46. From this construction, it will be seen that the tool may be removed and a different style tool substituted therefor, if desired.

In operation, the lathe is driven by any suitable power and as shown in the drawing, the same may be operated by a belt 47 passing over a pulley tS keyed to the spindle of the head stock. It will'be understood that the watch back 22 is placed in die and held therein by means of the stem 31 carried by the tail stock. The rotation of the spindle of the head stock will cause the chuck it) to to tate and in so doing the teeth on the die meshing with the teeth 42 on the collar will impart rotary motion to the tool 40, it of course being understood that the carriage has been moved to bring the coacting teeth into engagement vith each other. The tool now being in motion, the spinning surface l3 is brought into contact with the upstanding flange 49 on the back 22 by operating the holder by means of a handle 50. It is necessary for the operator to apply force to the tool to hold thesame in contact with the work and to keep the teeth in co-acting engagement with each other. The collar being yieldingly mountedpermits the inward movement of the same as the flange 49 is gradually worn down to form the necessary finished rim 51.

It is to be understood that various machines have been employed for forming a rim on the back of a watch case but operation of the spinning tool is not controlled in the manner as herein shown and described. It is further to be understood that the machine might be employed for forming a sharp rim on various other objects and I do not wish to limit myself to the particular use herein mentioned.

What is claimed as new is 1. A machine of the class described, the on said head stock, means for supcombination of a lathe having a headstock and a tail stock, a chuck rotatably mounted on said head stock, means for supporting a piece of work in said chuck, a tool for operation on said work, andmeans for imparting rotary motion from said chuck to said tool, said last means including a yieldable tooth surface fo med on said chuck for co-action with a tooth surface on said tool.

2. A machine of the class described, the

combination of a lathe having a head stock and a tail stock, a chuck rotatably mounted on said head stock, means for supporting a piece of work in said chuck, a tool for operation on said work, means for adjust ably mounting said tool adjacent said work, and means for imparting rotary motion from said chuck to said tool, said last means including a yieldable tooth surface formed on said chuck for co-action with a tooth surface on said tool.

A spinning machine including a lathe having a head stock provided with a spindle, tail stock, a block rotatably mounted on the spindle of said head stock, a die member mounted on said block, a collar yieldingly mounted on said block and slid, able over said-die member, means carried by said tail stock for holding a piece of work in engagement with said die, a carriage mo'vably nounted on said lathe, a holder mounted on said carriage, a tool rotatably mounted on said holder, and co-acting means on said tool and collar for imparting rotary movement to saidtool.

4-. A spinning machine including a lathe having a head stock provided with a spindle, a tail stock, a block rotatably mounted on the spindle of said head stock and removable therefrom, a die member mounted on said block, a collar yieldingly mounted on said block and slidable over said die member, means carried by said tail stock for holding a piece of work in engagement with said die, a carriage movably mounted on said lathe, a holder mounted on said carriage, a tool rotatably mounted on said holder, means for detachably connecting said tool with said holder, and co-acting means on said tool and collar for imparting rotary movement to said tool.

5. A machine of the class described including a rotatable block, a die member removably secured to said block, a yieldable collar slidably mounted on said die member, means for limiting movement of said signature,

JOHN MULLER.

Certificate of Ci'irrectien.

It is hereby certified that in Letters Patent No 1520 594. granted Dccemher 2?) 1924. upon the application of John Muller. oi Beechurst, Long; Island, New York for an improvement in hlachines for Forming a Rim on the Back of lvzitchcases,

an error appears in. the printed specification requiring? correction as follows: Page 2, claim 1, strike out line 46: and that the said Letters Patent should he read with this correction therein that the same may conform to the record of the case in the Patent Office. Signed and sealed this 27th (lay of January, A. D. [SEAL] KARL FENNING,

Acting Commissioner of Patents. 

